This problem occurs when I am playing music via Spotify in a group and I try to adjust individual volume in the Sonos app.
When I adjust the individual volume on one speaker, it affects the volume on every other speaker in the group. Also, the speaker I am adjusting bounces to different level.
This just started happening today. It worked for two years without this problem.
Best answer by Corry PView original
Welcome to the Sonos Community!
I can’t say that I have ever heard of this before. I recommend a reboot of the devices involved (including your phone/tablet), and if that doesn’t help I recommend you get in touch with our technical support team, who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports.
I hope this helps.